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LibJS: Add the WeakRef.prototype.deref method

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This is the only exposed method of the WeakRef built-in.
This commit is contained in:
Idan Horowitz 2021-06-12 17:40:33 +03:00 • committed by Linus Groh
parent 7eba63a8a3
commit b9d4dd6850
3 changed files with 41 additions and 0 deletions
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17
Userland/Libraries/LibJS/Runtime/WeakRefPrototype.cpp
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@ -18,6 +18,8 @@ void WeakRefPrototype::initialize(GlobalObject& global_object)
auto& vm = this->vm();
Object::initialize(global_object);
define_native_function(vm.names.deref, deref, 0, Attribute::Writable | Attribute::Configurable);
define_property(vm.well_known_symbol_to_string_tag(), js_string(global_object.heap(), vm.names.WeakRef), Attribute::Configurable);
}
@ -25,4 +27,19 @@ WeakRefPrototype::~WeakRefPrototype()
{
}
// 26.1.3.2 WeakRef.prototype.deref ( ), https://tc39.es/ecma262/#sec-weak-ref.prototype.deref
JS_DEFINE_NATIVE_FUNCTION(WeakRefPrototype::deref)
{
auto* this_object = vm.this_value(global_object).to_object(global_object);
if (!this_object)
return {};
if (!is<WeakRef>(this_object)) {
vm.throw_exception<TypeError>(global_object, ErrorType::NotA, "WeakRef");
return {};
}
auto& weak_ref = static_cast<WeakRef&>(*this_object);
weak_ref.update_execution_generation();
return weak_ref.value() ?: js_undefined();
}
}

3
Userland/Libraries/LibJS/Runtime/WeakRefPrototype.h
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@ -17,6 +17,9 @@ public:
WeakRefPrototype(GlobalObject&);
virtual void initialize(GlobalObject&) override;
virtual ~WeakRefPrototype() override;
private:
JS_DECLARE_NATIVE_FUNCTION(deref);
};
}